LayoutShift: lastInputTime property

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The lastInputTime read-only property of the LayoutShift interface returns the time of the most recent excluding input or 0 if no excluding input has occurred.

Layout shifts are only bad if the user wasn't expecting them. Layout shift metrics like CLS exclude shifts that occurred soon after certain user interactions. These interactions are called excluding inputs. Excluding inputs are:

  • Any events which signal a user's active interaction with the document: (mousedown, keydown, and pointerdown)
  • Any events which directly changes the size of the viewport.
  • change events.

The mousemove and pointermove events are not excluding inputs.

Value

A DOMHighResTimeStamp indicating the most recent excluding input time or 0 if no excluding input has occurred.

Examples

Logging last input times

Log excluding input times if excluding input has occurred.

js
const observer = new PerformanceObserver((list) => {
  list.getEntries().forEach((entry) => {
    if (entry.lastInputTime) {
      console.log(entry.lastInputTime);
    }
  });
});

observer.observe({ type: "layout-shift", buffered: true });

Specifications

Specification
Layout Instability API
# dom-layoutshift-lastinputtime

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
lastInputTime
Experimental

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.

See also